Lionel E. Weiss's The Minor Structures of Deformed Rocks: A Photographic Atlas PDF

By Lionel E. Weiss

ISBN-10: 3642486096

ISBN-13: 9783642486098

ISBN-10: 3642486118

ISBN-13: 9783642486111

Perhaps the main extraordinary impact won via a geologist in the course of two decades of box paintings with deformed rocks in lots of elements of the area is that the minor constructions in those rocks are strangely uniform of their houses and constrained of their type. in reality, a comparatively brief and easy checklist can comprise all buildings that are either one of universal incidence and of use to the structural geologist in his makes an attempt to appreciate the constitution and evolution of a deformed geologic physique. the images during this publication were chosen to demonstrate as basically as attainable the most obvious features of the typical minor buildings of deformed rocks. i've got attempted to make this option actually consultant despite elements that experience affected the alternative. First, i've got integrated in basic terms images made in the course of my very own box paintings. without doubt the choice might have been significantly greater in either caliber and diversity by way of together with images made by way of different geologists. moment, the images unavoidably mirror my very own inte­ rests and never these of each geologist desirous about deformed rocks. for this reason, for instance, nice emphasis has been put on folds, while faults and joints are completely omitted.

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Extra resources for The Minor Structures of Deformed Rocks: A Photographic Atlas

Example text

Cleavage subparallel to the axial plane of a fold in bedded gray- wackes and siltstones is most pervasively developed in the darker, less sandy layers. A small fault displaces the upper limb of the fold. Carbonifeorus, Millook Haven, Devonshire, England 14. Detail of Plate 13 B 15. Axial plane cleavage is most strongly developed in fine-grained bed in core of the fold. From the same locality as Plates I 3 B and 14 16. A prominent slaty cleavage dips steeply left across more gently dipping bedding in slate.

Bedded graywackes and siltstones dip steeply left. The character of the cleavage in each layer reflects its composition and grain size. A coarse graywacke (right) has discrete subhorizontal cleavage fractures; a medium-grained siltstone (left, beneath hammer) has moderately dipping pervasive cleavage. The most steeply dipping and finely pervasive cleavage (center) is in the layer with finest grain. From the same locality as Plate 4A 5. Structural features are similar to those of Plate 4 B. From the same locality as Plates 4A and 4 B 6A.

Pervasively cleaved mudstones show no obvious bedding. Lower Devonian, Col d' Aspin, Pyrenees, France 8. Along the margin of a body of spilitic volcanic rocks enclosed in metamorphosed sedimentary rocks a platy foliation (dipping steeply left) is developed. Pre-Cambrian, Llanddwyn Island, Anglesey, Wales 9A. A finely pervasive slaty cleavage (dipping gently right) is developed in silty beds (horizontal) in otherwise uncleaved graywackes. Silurian, near Kirkudbright, Scotland 9 B. Subhorizontal bedding in mudstones and siltstones is crossed by finely pervasive cleavage (dipping steeply right).

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The Minor Structures of Deformed Rocks: A Photographic Atlas by Lionel E. Weiss


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